I would in your case take a magnifying glass and really strong light source
and thoroughly check one and every solder joint. I known you said you
resoldered components around triangle generator but what about the rest?
I repair synthesisers for living and with intermittent faults like this
this thorough optical inspection shown the problem in most of the cases. I
would specifically look around where mechanical twisting / pushing of the
controls can introduce stress to the component connections.
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On Mon, 22 Mar 2021, 05:40 Ozan, <ozan_g@...> wrote:
Removed solder and
re-soldered all components from triangle generator, checked all diodes
for
normal behavior (in circuit).
Did you already check CR245/CR248/CR250/CR246 and resistors R245, R248,
R250? The voltages you measured at two sides of the bridge are not
consistent if all the components are good. Perhaps component tester failed
to catch the intermittent behavior. Do you measure 1.116-0.6=0.516V at
cathode of CR248 in stuck state? Or do you measure a negative voltage (bad
CR248)?
Ozan
